Sains Malaysiana 30: 195-202 (2001)                                                                           Sains Fizis dan Gunaan /

Physical and Applied Sciences

 

Effects to Magnesium addtion on Microhardness

in Eutectic Al-Si-Mg Alloys

 

 

Abdul Razak Daud & Ibrahim Abu Talib

Pusat Pengajian Fizik Gunaan

Universiti Kebangsaan Malaysia

43600 UKM Bangi, Selangor D.E.,Malaysia

 

Mohd bin Harun

Institut Penyelidikan Teknologi Nuklear Malaysia

43000 Kajang, Selangor D.E.,Malaysia

 

 

 

ABSTRACT

 

The eutectic Al-Si-Mg alloys were prepared and heat treated at 327oC and 540oC for 10 hours and followed by ageing at 160oC for various ageing times.  The microhardness of the alloys increased as the ageing time and magnesium content increased.  The addition of magnesium as well as ageing strengthened the matrix and improved the second phase morphology.

 

 

ABSTRAK

 

Aloi-aloi Al-Si-Mg eutektik telah disediakan dan dirawat haba pada suhu 327oC dan 540oC selama 10 jam dan seterusnya dilakukan penuaan pada suhu 160oC bagi beberapa tempoh tertentu.  Mikrokekerasan aloi berkenaan telah meningkat apabila tempoh penuaan dan kandungan magnesium ditingkatkan.  Penambahan magnesium dan juga penuaan telah menguatkan matrik dan memperbaiki lagi morfologi fasa kedua.

 

 

RUJUKAN/REFERENCES

 

Abbot, T.B. & Parker, B.A. 1990.  The structures of fully eutectics aluminium silicon alloy castings. J. Matter. Sci. 25: 2100-2106.

Harun, H.J. & McCormick, P.G. 1979.  Effect of precipitation hardening on strain rate sensitivity and yield behaviour in an Al-Mg-Si alloy. Acta Metall. 27: 155-159.

Linggin, L., Simon, J.P. & Guyot, P. 1980.  Residual resistivity during clustering in Al-Zn solid solutions.  Acta Metall. 28:  1111-1122.

Kelly, A. & Nicholson, R.B. 1963. Progress in Materials Science. London: Pergamon.

Pramila Bai, B.N. & Biswas, S.K. 1991. Effect of magnesium and heat treatment on mild wear of hypoeutectic aluminium-silicon alloys. Acta Metall. Mater. 39: 833-840.

 

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